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Subject: Re: [OMPI devel] mpi very slow to start on Mac OS X
From: Christopher Jefferson (chris_at_[hidden])
Date: 2009-05-06 16:29:42

Apologies, soon after I sent my mail I managed to solve my own problem.

For possible future reference, the problem was that my disconnected
ethernet port had somehow decided to take up residence on the same
subnet as my wireless. The relevant parts of ifconfig are:

lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
        inet netmask 0xff000000
        inet6 ::1 prefixlen 128
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1
gif0: flags=8010<POINTOPOINT,MULTICAST> mtu 1280
stf0: flags=0<> mtu 1280
        inet netmask 0xffffff00 broadcast
        ether 00:25:00:a9:68:44
        media: autoselect status: inactive
        supported media: none autoselect 10baseT/UTP <half-duplex> 10baseT/
UTP <full-duplex> 10baseT/UTP <full-duplex,flow-control> 10baseT/UTP
<full-duplex,hw-loopback> 100baseTX <half-duplex> 100baseTX <full-
duplex> 100baseTX <full-duplex,flow-control> 100baseTX <full-duplex,hw-
loopback> 1000baseT <full-duplex> 1000baseT <full-duplex,flow-control>
1000baseT <full-duplex,hw-loopback>
        inet6 fe80::225:ff:fe3e:2474%en1 prefixlen 64 scopeid 0x5
        inet netmask 0xffffff00 broadcast
        ether 00:25:00:3e:24:74
        media: autoselect status: active
        supported media: autoselect

By disabling en0 with 'sudo ifconfig en0 down', open-mpi performs as